MICROWAVE AND FAR INFRARED-SPECTRUM OF NITROGEN TRIFLUORIDE

The microwave and far infrared rotational spectrum in the ground vibrational state of 14NF3 has been observed and analyzed up to J = 60. A tunable sideband spectrometer has been used in the FIR region. The resulting molecular constants are (in MHz) B0 = 10 681.092679(39), DJ = 14.61109(11) 10-3DJK = -22.77154(71) × 10-3, HJ = 0.019529(95) × 10-6, HJJK = -0.09847(96) × 10-6, HKKJ = 0.1490(10) × 10-6, LJJK = -0.00072(12) × 10-9, and (eQq)N = -7.0854(18). The millimeter-wave spectrum of 15NF3 has also been observed and analyzed, providing the following values of the rotational constants: B0 = 10 629.47940(23), DJ = 14.3234(12) 10-3, DJK = -22.2093(33) 10-3. © 1992.